Method and apparatus for making lamp filaments



June 16, 1925. 1,542,592

A. VELTING METHOD AND APPARATUS FOR MAKING LAMP FILAMENTS Fil d Oct, 31, 1923 2 Sheets-Sheet l i \l mu 1 ATTORNEY June 16, 1925. Y 1,542,592 A. VELTING METHOD AND APPARATUS .F'OR MAKING LAMP FILAMEQTS innnnm.

alumni Jll'li' Patented June 16, 1925.

UNITEDVSTATE'S ANTONVELTING, or AsPE'TH, NEW YORK.

METHOD AND APPARATUS ron MAKINGLAMr rrLAMnurs.

Application filed October 31, 1923. Serial No. 671,850.

To all whom'it may concern:

Be it'known that I, ANTON VEL'IING, a native and citizen ofGermany, and a re-sident of ,Maspeth, Long Island, county of Queens, and State ofNew York, have invented certain new and useful Improvements in Methods and Apparatus for Making Lamp Filaments, of which the following is a specification suflicient to enable those skilled in the art to which the invention appertains to utilize the same.

The object of my invention is to simplify and cheapen the production of the spirally convoluted light filaments usedin incandescent electric lamps, and atthe same time render theproduct more perfect and uni form than previously attainable, and the invention consists essentially in forming said spiral con-volutions of the filaments continuously on a fixed mandrel by and between rotary dies having peripheral pitch threads relatively co-related, substantially as hereinafter described and claimed specifically,

in contradistinction to the old method of forming the filament convolutions around a movable wire mandrel which has to be eliminat-ed by chemical action, involving loss in both material time andlabor.

In the accompanying drawings, I illustrate by way of exemplification apparatus adapted to the practical utilization of my invention, although I do not limit myself to the identical form and construction of parts shown, since modifications in minor details, and equivalent mechanical expedients, may be resorted to with like results, and without departing from the spirit and intent of my invention in this respect.

Furthermore, the drawings are necessarily made on a relatively large scale, approximately in the proportion of five to one as related to the actual size of apparatus, the convoluted spiral filament product being in practice only about the diameter of twenty-five one-thousandths of an inch, more or less.

With this understanding:

Figure 1 represents an elevation of the supporting frame and operative parts of my filament spiralling means;

Fig. 2, a horizontal section thereof, taken upon plane of line 2-2 Fig. 1;

Fig. 3, a horizontal section thereof, taken upon plane of line 3-3 Fig. 1;

Fig. 4, a vertical sectional elevation taken upon plane of line 44 Fig. 2;

Fig.5, an enlarged sectional view of the peripherally threaded formative dies only,

but taken upon general plane of line 55 Fig. 1;

Fig. 6 is a sectional elevation of said formative dies, on the same scale as F ig. 5, illustrating the practical operation thereof in conjunction with said Fig. 5,-the

grooves in the periphery] of the die shown in elevation being omitted in part for clearness of illustration; I i i Fig. 7 is a detail view of the fixed mandrel member;

Fig. 8 is a detail view of one of the forma- I tive die shafts, broken away in part;

Fig. 9 is adetail elevation, broken away in part, of the power shaft; and

, Fig. 10 is a detail elevation, broken away in part, of the intermediate power transmitting shaft.

In the specific construction of apparatus shown in the drawings, B, represents what may be designated as the base plate, and

B,the head plate, both united integrally" integrally with itsown pinion d near its lower extremity.

These pinions (Z mesh with, and are driven by, gears 19, and i, the one 10, on the power shaft P, and the othert', on the intermediate shaft I, as indicated more particularly in Fig. 3, of the drawings,said shafts P, and I, being rotatably mounted upon and between the base plate B, and the head plate B.

The formative dies, d, d d*, are shaped peripherally with spiral grooves or threads of like depth and pitch, but so timed and positioned as related to each other as to constitute between them a spiral matrix for the creation of the desired convolutions c, of the wire a, used subsequently in the formation of the usual filament loops for installation in the glass bulbs of incandescent lamps in a manner well known in the art,-my invention relating solely to the means and method of forming the usual convolutions on said filament wire.

By my invention I attain a perfect, positive product, in a simple, cheap and effective manner, there being practically no waste of material involved, with a minimum of time and labor, obviating the loss incidental to, and inevitable in, the old method of forming the filament convolutions around 'a soluble Wire mandrel, subsequently removed by chemical action.

It is to be understood that the formative dies d, (Z (Z are of equal diameter, and

that the 'pinions d", are also of equal diameter.

What I claim as my invention and desire to secure by Letters Patent is:

1. The method herein set forth of convolutingfilaments for incandescentelectric lamps of the character designated, consisting in passing the filament wire over a fixed mandrel and between a plurality of formative dies having peripheral thread-grooves of like pitch and depth and relatively positioned to afford a spiral matrix by and between their opposed surfaces and said fixed mandrel, holding said mandrel fixed during such operation and removing the completed filament from the mandrel, substantially in the manner and for the purpose set forth.

2. Apparatus for convoluting filaments for incandescent lamps of the character designated, comprising a fixed mandrel independent of the completed filament, and a plurality of formative dies each with its own pinion and having peripheral threadgrooves of like pitch and depth and relatively positioned to afford a spiral matrix by and between their opposed surfaces and said fixed mandrel, substantially in the manner and for the purpose set forth.

3. Appa atus for convoluting filaments for incandescent lamps of the character designated, comprising a fiXed" l11E1'11Cl1el independent of the'comp'leted"filament, and three equidistant fori'native'dies each-With its own pinion and having peripheral thread-groovesof like pitch and depth and relatively positioned to aflord a spiral matrix by and'between'their opp'osedsurfaces and said fixed mandrel, substantia-lly in the manner and for the purpose set forth;

4. In a device'of'the character'stated, a base plate, ahead plate, means holding them at a predetermined distance apart, a mandrel rigidly aflixed in the h'eadplate, equidistant formative dies about said mandrel'and in axial a'li'nement centrally therewith, shafts integral with said dies, means for rotating said shafts, p'inionson' said shafts, and gears for actuating said pinions, said dies forming a spiral matrix-for forming convolutions of a wire.

ANTON VELTING.

Yy itnesses hflA'rHnLnA STEUERNAGEL, G120. WM. MIATT. 

